QuickBooks 2013 Maintenance Release 4 is available for manual download. You may want to wait until it is an automatic download in the event the find and fix problems before it releases to everyone. Typically, at release 4 is when we find a new version of QuickBooks to be stable enough to recommend to clients. Here’s a couple articles on the changes.
http://www.sleeter.com/blog/2012/12/quickbooks-2013-r4-released/